Leviticus 25:38-43

I am ADONAI your God, who brought you out of the land of Egypt in order to give you the land of Kena'an and be your God.

"'If a member of your people has become poor among you and sells himself to you, do not make him do the work of a slave.

Rather, you are to treat him like an employee or a tenant; he will work for you until the year of yovel.

Then he will leave you, he and his children with him, and return to his own family and regain possession of his ancestral land.

For they are my slaves, whom I brought out of the land of Egypt; therefore they are not to be sold as slaves.

Do not treat him harshly, but fear your God.